Condenser



I will be later explained.

Patented Jan. 8, 1929.

MILTON O. FREDRICKSON, 0F OAKLAND, CALIFORNIA.

CONDENSER.

- I Application filed October 7, 1927. Serial No. 224,686.

The present invention is directed to improvements in condensers used inconnection with radio sets.

The primary object of the invention is to provide a device of thischaracter so constructed that the capacitiesthereof can be readilyvaried in a simple and uniformmanner. 1 Another object of the inventionis to provide a device of this kind which is extremely simple inconstruction, efficient inoperation, and one which can be manufacturedat a very small cost.

Inthe accompanying drawing: 5

Figure 1 is a front view of the condenser showing it in a protectivecasing, parts of the casing being broken away.

Figure 2 is a bottom plan view,

Figure 3 is an end view. Figure 4 is a sectional view on line H ofFigure 1.

Referring to the drawing, 1 designates a metallic casing which iscapable of being mounted'in a cabinet, not shown, and not only preventsentrance of dust to the condenser, butalso serves as a shield againstelectrical static.

Supported within the casing 1 is a frame 2, the lower corners thereofbeing provided with offset ears 3 in which are j'ournaled the ends ofthe shaft 4, the purpose of which A plurality of plates 5, three beingshown,

' but it will be of course understood that the number may be varied asdesired, are supported in spaced relation upon the frame 2 and separatedtherefrom by disks 6 of suitable insulating material which are engagedon the screws 7 and 8, and may be formed from suitable metal such ascopper, brass or aluminum. In this manner the. plates 5 are fullyinsulated from the frame 2. The screws 7 pass through holes in the metalcasing to facilitate connection to the plates 5, the holes being ofsuflicient size to allow a clearance between the screw and casing.

The movable plate 9, also formed from Copper or other suitable metal,has its lower corners provided with brackets 10 which are fixed to theshaft 4 in order that when the shaft is turned the plates will he swungtoward or away from the plates 5, as desired.

One end of the shaft at is extended through the end of the casing andupon the extended end is fixed atoothed segment 11 which meshes with aworm 12 fixed to the tuningshaft 13, said shaft being journaled in abracket 14 fixed to said casing. This shaft also carried a 'pinion 15which meshes with a gear 16 rotatably supported by the bracket 14, saidgear constituting a logging dial and being of any suitable size. Theshaft 13 is further provided with an operating knob 17.

It will be obvious that upon rotating the knob 17 rotary movement willbe imparted to the shaft- 13 and worm gear 12, whereupon the segment 11will be actuated to .rotate the shaft 4 in order that the plate 5) canbe swung toward or away from the plates" 5, as desired.

Having thus described the invention. what I claim is:

1. A condenser comprising a frame, a plurality of plates carried by theframe and insulated therefrom, said frame having ears carried thereby, ashaft journaled in the ears, and having a plate fixed thereto, a segmentcarried by one end of the shaft, a worm engaged with the segment, andmeans for rotating the Worm and thus operating the segment to rotate theshaft to move the plate toward or away from the plates.

2. A condenser cou'i prising a frame. plates electrically insulatedtherefrom, said frame having ears carried thereby, a shaft journaled inthe ears, a plate having brackets carried thereby for fixed engagementwith the shaft, said shaft having a toothed segment carriedthereby, atuning shaft having a worm carried thereby and adapted to mesh with thesegment, said shaft having a pinion carried thereby, a dial in mesh withthe pinion, and a knob carried by the tuning shaft for actuating thesame to transmit movement to the first-named shaft to swing the platetoward or away from said plates. In testimony whereof I affix mysignature.

'MILTON O.- FREDRICKSON.

